Answer:
B
Step-by-step explanation:
Permutation is considered an ordered combination. The general formula for this is:
P(n, r) = n! (n-r)!
where:
n=
The solutions for ‘x’ in the given equation are – 3 and - 7
<u>Step-by-step explanation:</u>
Given equation:

To find the ‘x’ value, try to factor, because in this case it works, it's fast. By using factor method, we get
(x + 3) (x + 7) = 0 (adding both value we get 10 and multiply as 21 as in equation and check with signs also while factoring)
x = - 3, -7
Verify above values by multiply both terms,
(x + 3) (x + 7) = 0

(so values obtained from factor method are correct)
Or, can use quadratic formula, for
, the solutions are given by:

In the given equation, a = 1, b = 10, c = 21, apply these in above formula


So,
When 
When 
Hence, the values for ‘x’ are - 3 and - 7
Answer:
128.4 Miles
Step-by-step explanation:
She goes to work and goes 10.7 miles, and then goes back home aswell which is also 10.7 miles. So total miles in one day = 10.7 + 10.7 = 21.4 miles in one day.
so 1 week = 21.4 x 6
128.4 miles.
we times it by 6 because she works 6 days a week only.
hope it helped :)
. . Hmmmmmmmmm, I wonder what the answer could be XD